A wiring diagram is a straightforward visual representation with the physical connections and physical layout of the electrical system or circuit. It shows what sort of electrical wires are interconnected and will also show where fixtures and components might be coupled to the system.

When and How to Use a Wiring Diagram

Use wiring diagrams to help in building or manufacturing the circuit or computer. They are also a good choice for making repairs.

DIY enthusiasts use wiring diagrams but you are also common in home building and auto repair.

For example, a house builder should confirm the geographic location of electrical outlets and light-weight fixtures employing a wiring diagram to avoid costly mistakes and building code violations.

How can be a Wiring Diagram Different from the Schematic?

A schematic shows the program and function with an electrical circuit, but is not focused on the physical layout with the wires. Wiring diagrams show the way the wires are connected and where they need to found in the actual device, plus the physical connections between each of the components.

How is often a Wiring Diagram Different from a Pictorial Diagram?

Unlike a pictorial diagram, a wiring diagram uses abstract or simplified shapes and lines to demonstrate components. Pictorial diagrams in many cases are photos with labels or highly-detailed drawings in the physical components.

Standard Wiring Diagram Symbols

If a line touching another line carries a black dot, it indicates the lines are connected. When unconnected lines are shown crossing, you can see a line hop.

Most symbols used on a wiring diagram resemble abstract versions with the real objects they represent. For example, a switch will be a break in the line with a line at an angle towards the wire, comparable to a light switch you can flip on / off. A resistor will be represented with a compilation of squiggles symbolizing the restriction of current flow. An antenna is a straight line with three small lines branching off at its end, much like a genuine antenna.

Wiring diagram symbols

Wire, conducts current

Fuse, disconnect when current exceeds some amount

Capacitor, used to store electric charge

Toggle Switch, stops the flow of current when open

Push Button Switch, momentarily allows current flow when button is pushed in, breaks current when released

Battery, stores electric charge and generates a consistent voltage

Resistor, restricts current flow

Ground wire, used by protection

Circuit breaker, utilized to protect a circuit from an overload of current

Inductor, a coil that generates a magnetic field

Antenna, transmits and receives radio waves

Surge protector, employed to protect a circuit from a spike in voltage

Lamp, generates light when current flows through

Diode, allows current to circulate in one direction indicated by an arrowhead or triangle around the wire